package mapReduce.demo05_shuffle.demo04_monthTempCount;

import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Reducer;

import java.io.IOException;

public class MonthTempCountCombiner extends Reducer<Text, IntWritable,Text, IntWritable> {

    IntWritable outValue = new IntWritable();

    @Override
    protected void reduce(Text key, Iterable<IntWritable> values, Reducer<Text, IntWritable, Text, IntWritable>.Context context) throws IOException, InterruptedException {
        int sum = 0;

        for (IntWritable value : values) {
            sum+=value.get();
        }

        outValue.set(sum);

        context.write(key,outValue);

    }
}
